`webadmin` should be able to delete oidc administrators with email rather than guid

[hagaram]

Hi,

user, which was registered/signed in to admin UI vi SSO, wont get deleted via standard webadmin command.

WAG command says "OK", but the user is still present.

I managed to delete the user with etcdctl and GUID like this

/tmp/etcdctl --endpoints=unix:///tmp/wag.d.etcd.XXXXXX   get "admin-users-" --prefix  | grep <YOUR USER NAME> | jq  -r '.oidc_guid'
"<GUID YOU WILL NEED FOR DELETION IS RETURNED>"

/tmp/etcdctl --endpoints=unix:///tmp/wag.d.etcd.XXXXXX del "admin-users-<USER GUID>"

[NHAS]

If you use the webadmin command and put the guid in the username field that should function.